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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c03d1579551196be2d5c9b0f729607f8980365d6861e8a9a8c26371b4aedf84' 
  AND token = '1k5GWoAi4hMwhDJoR0mD10+HFhRZSKHPrtgDs/hAGDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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