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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673183e7c0c0d30ea43db8438e83b8cf589a16e5ee293e7aed162517cb0e04e5' 
  AND token = 'xl39dIG2T0rZWbvmPSpMWLPSOMke6CAKY6um/XIXTKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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