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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa08f523c4e74f5da1388d205f40309dd8ad740006b93b34f34c3e2d9b87c54' 
  AND token = 'EZGLRPSkwH+h66kxBSG8pM5viF1W7+Oakw/Hmx5JZ+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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