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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69eb5707cf8c10958c68f0394fc96d631bcde1c621d4e0bef07a9a7e2c3a3fd5' 
  AND token = 'inGSEVL880hBYdVQKIih9khoO1j+14xzaJolDoiS7QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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