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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd157635607a2f16c124c34638e02156cbd6dd859a3c23b5bcc30d5dfd0923f37' 
  AND token = 'CwSkNT0xRVNSfXtH/7t2eyI4wxt/Tstx+Ps4RiUrm6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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