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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd55973f5f9142a8655b67779d9c039d7e223e02d1c1d6f94213d296461961e' 
  AND token = 'TAtwgDNFWDffBwV4d/fpe5FkaXsWl/PVRYeRwx/DfuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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