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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b07018b56451b6b5080ff517bb345d8788630b99b41739842184bd389a4750f' 
  AND token = 'MDEDAyWt7huZCTBmSpLU6BKQJ4YlOyULNynFl0kXXvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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