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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbdbf3d50e641d8f9a5836ab78599092362c1c0a0040078ef3960b2818a4cca' 
  AND token = 'i3JKJYtaNBZv1E9wqF/Tq3JdJ8cayu1xRuJUWBNLIKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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