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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794482b4ca8ffc82b5c4b4c5fe03e38eb0b77c5e070913de8aaf6ce08f9e3fef' 
  AND token = 'u3VkZfzy3PdwloCnH4+PIXp2elGrUWqEWbPVXSiih4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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