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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6551797180eb0d7942d2f4824711f3f40d5e004b02e879fab02d259fac57176' 
  AND token = 'O//6saNSH+Oimvvjkhk8eIZTSwFyekQd6+3VWIfw0ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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