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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88b6d76754007392ae9fdd2f261df98e97d2e1b2d2c3f732631553427a1baff' 
  AND token = 'RiOQtP7ZozR6hbTUbuTWBhrsFuHi6+xVsahSBhJ9ivs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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