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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e10b7df5ebdf122406f90282606d3aea436b47c7ff46111eca43d038d6dc36' 
  AND token = '854naCNMqtcvDgo5EdRmGPXo5sDSeRZMBukR7CknmxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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