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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c9468060371c58a13055194b312d680dd0587d66a586cbaccba5ef8eecdec6' 
  AND token = 'N33A+KTcJfLFSb5SI9ijBnRXhkg7Q+faZP547bMKqj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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