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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4f53ca77f11f10e63fdc3565f6041f4b79475b8a6f71078d21e4eddab10546' 
  AND token = 'iE8RRSBWr9WHHkCVU3DoNGhRPO7y2RDazboRB0Ovelc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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