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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48616451e6e282b3da8a3aae9c35c4e93445c419b1e655421403b5f8b79cda26' 
  AND token = 'KMPnR2e1BJ6xVGBX8iKU+P5A/PPogW9yHI9tx0qKg24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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