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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e8d66c8f6509e27023b62957bf88cda2ef1b2c6287a1c05c258116d5908347' 
  AND token = '6SriZlOiB3HH3Jq6uE3O/X/o6QRptgmxcd4OgMNTi8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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