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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40938b7b421f09803ead27d0d2ac89247e9e4758e54b545cb7f64a744713c778' 
  AND token = '5KWWtDsaLYfJoyn/8e1rv+KeQHcOxqoLlQ2b4L1hK7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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