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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ffae2883e017a67e0ca51bec17ed660e56bafd773016a9f8995c99a7b6f73a' 
  AND token = 'JxNbeQ9kXw20Qdl//f7G7uetaPdxaJCFlyW+L5N8Ryk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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