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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1913d736321e0a271c50c67c16137f03dd50bc2b5969b65fdadcfc9c6ce42be' 
  AND token = 'GSzJ6w5H5PydQM2dB8JaVJAdb/Cfw0+AjxqTsREXuLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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