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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e4dc3f997ce8310709e2de8431b165d262efefc1d280218d3a26cb2de6d508' 
  AND token = 'YE2NB5cx1HQJgxcqtYHzjZ0bmrjl+g1hl21VvNXg87c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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