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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b732b63bc35c2595bca6684148f68e3a908ecddece343a07a85a96932c1dc14' 
  AND token = '36ltArfOHFZNwe8VZbQR2BZQMvj58mLahyPtsv5DB60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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