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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ac70b354cb201ad14c363df2fd8b66f6e61356cc7c89388443996768974fd8' 
  AND token = 'W7hNsM3DQT6sqqDl9jOYFqyj5UJ+GNohg6yLGG3E/YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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