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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94743147ffaa823d2b35e43695cb864ea5b54b3c1be8f53fe0719607236c1193' 
  AND token = '3xCMmVNDHOw/jhjjKd0L5WAz2A+32w2Yn615m3n7OqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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