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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6594e5987161e285ba2a6c104c59cfced0d427816c0e4542ea8952d6741074ac' 
  AND token = '1jS4GR7HusSiKpv7M0LatqSqFR4rW8fPlW429b0FCGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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