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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f524b9fa20e863e85d83d033548337810dc0f601f4dd8a6f9d57a5d68361839a' 
  AND token = 'Rle8c6pjs/w/Ts6ZC8UiKil52eK6ZxL0knCTK1ISDO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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