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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799eeff180ecff10dbdc1f2e77cce0946ee206fb7d10695d3636d9a3634d5d22' 
  AND token = 'ENguBvOJ2JResAXKJ1E4bAOliSB3dnV0Kxti0Q9uXVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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