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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c4040fdd45f7707eb58330c8bcad1cc0b1df1e4329895abd282f86901e5b79' 
  AND token = 'bTFWbsM9elIbXPtJwBF/KXpgs6FZwtSpQ1/aekorlAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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