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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6a31b1920fdc1c75508af387d317842d405be99f57d594955d499fd9bb1cc9' 
  AND token = 'K/sEojj3zvR7xbYWX5UfChPan9ESni1i+ssh1y1dN9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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