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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c6e31e9cbc3ddd7fa3a021fe74c3bcb928fbe8f6a0a8e9c50ded0ee0d153b8' 
  AND token = 'IZOGDMZw2rYJxgks9Qnh58LEgjT7i58fboH2nzB0nZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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