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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7407cd38d457b27355964b0bac3294edfbe9063071839890ccaad0782a94c2a' 
  AND token = '4Q4JqzA4eTHbLq+v3UWvcbgW+B5PiQ7W/gJLkoJAou0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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