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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1723e369bb18716d79bab76bd00668a820981e9f8b2b5a7cc5356b46031d56' 
  AND token = 'JqzN3SUwX1dHneyAobrwNjmZcMQKysYelj+HBzipB2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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