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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789a0b77fc19d6c032053948dceef2841c56e3024fd6dfa477dbb8914d888eef' 
  AND token = '+3B8htjDn5I80u0XTd3CYzA1BPZU4otQSPvWZwx2JY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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