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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba113edc82159e9cedb0e874620303018a061f9bda59362253508e475d992b84' 
  AND token = 'IO9w3B3RaXEqzX/LM0pWWPioyZ4lHT7ox5bT1xz7gRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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