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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1863aa038a63dc83d93a42c912aa813feaf892b9feab07dc4a9adb7009a049' 
  AND token = 'BeuFlncgnwxM825UDwoJwl7jjkg2E2P5s2M7vFa6MZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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