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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe08d2430d7f88c2c824c13c5adaa4429b6ea19b5e88cc7c8b86a1ce56182957' 
  AND token = 'V1eGML6HImz4Drs0Ej1THJrRY5atAL/tqxMPKKvKtHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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