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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f7de3dce7612f65ffe1cc9dd5433d096b223913cf96ac868d28d7d88349880' 
  AND token = 'o8eC8x3sGG87OHjSwTxt9nNtaCE/jEmbGRskwCmzPx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}