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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0309b7c433f1fa9c505d667dc16802d85bbee995a0945414b85c4c139d85a0b' 
  AND token = 'ieWTSesE3MNtgzlKWEruPbI6wKGTfckLLabOYdqMUtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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