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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584a51abfba0f39a67d2545a4e4ebaa611776e91b33f9d4175933eeb6b45e48f' 
  AND token = 'DwkXnI2cuUTU5G3uWHSB65RJokAP1gdR7+9A9QDxSNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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