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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7cfdd5f3231c27305d5fcbf729ff3a9e2654e6362e51c894381eb2a87c728e' 
  AND token = 'BJtzafo8cehWVclE+a8CbWgO0kPeoGEXUXvI4b38e5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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