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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee37d045aeae63a8c4b777254c5b536f4ec0afc9cc935c3fa52ac461693a4ed' 
  AND token = 'cfjFHQpt2X7Ga642x7XRI9n62MiRg1Mk1mbasceYWXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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