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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67330ec0aec9b35a862e4b0a1e7d4c7392d155d2a9544fef8eab8fb98206c25f' 
  AND token = 'jrfCzZNJy3+JXZg5bzaEvIbzj+ZvQlbjMX6Bp7mQMbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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