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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4166b43d2aa95540940ce459834dec33f22e45c3df0a58af1cc4d2ec6862b97' 
  AND token = '71fcKHsk3EJEfADN5En21PB0bCny6N/twbXdWuy7Ems=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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