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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3a67493c6ad580ce695a282e9b09254c892ba721f4915200921a37b93c33e6' 
  AND token = 'isIO3hEEjXtd/wJhhioj6MG9sjTl2ga9fHpO6PWqiIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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