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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7b1372a94da37a9c2215d87eb4d719e52e9f584d9511c7287d96367713936a' 
  AND token = 'oLUOOZoOS7HM4F5DdE3iQY3j4jGQtMi3pTnpUZp1DzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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