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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae36999ede844a0ec19a5ddf0e15784a2203c5af8f67cdbdc12fb0cbbd3c1b6' 
  AND token = 'C8t0sciRs0wtL0Ui/93WIpAercwbZF/VxEsXtS6tdE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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