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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68a207e1107145c8bab3757fa843adf373c15ff1d7c03b3097039fb451df187' 
  AND token = '5DGo7SJsGK/A9xAFSpw3qf2J5MUPdiopM9R/W8+D7E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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