SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '422d1611a21973c6b7f10e47863746c8c02a72096793c42d7da08a53fe8886fb' 
  AND token = '3WHNXWO/eqbVv0jutDULN0XjzGlKCfFhE/4Ex6fO8xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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