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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989469dbad496af639c5e9137f146a8833301cba84181e2cf02cce44273a0bba' 
  AND token = 'UsBDU9TkCt1OO4lUJNsvCx/w0rtFTJ+zT9p99bj5ZJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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