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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0b6fe475206b7962519f84f5f8785b24bdff2447c876c856ee58da7ac8d15e' 
  AND token = 'MHDQKij7eqH+qt87qZVKYXm5Wcc99zrfol6gyIQGRQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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