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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ad691e835dde0c9d38a979c8a4c0f2de2f670ad01f0bb149c26941d5209998' 
  AND token = 'KTt0EuQoZcVmLt59i3XrvpD0WuxMXfkJukrZd8Mi9T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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