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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2ee0f54d49d9d532c034aa045ae02cfed9b93b17ad68360c6b740e9eb175c7' 
  AND token = 'ZL3B1xc984y2sH27A1onlTp8Cc4jrBbPZ9nmlWvosdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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