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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561e76cd2d58d14cd969aca16b446c7fdf5c2e389a6748d89d86fa7837c89ce8' 
  AND token = 'tuJYvfB5R8QJTQsrwXMMQ82J/aUhSYDCXbMJshJIq2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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