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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa2fb3ab44827572ec23e5602d8fc1bdf822724e0120f3889091b4eaa27fa9f' 
  AND token = 'Ry5zeZdNWkAI5nh6LOMnG27eOGUevr44pGPdvC4jWyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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