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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfacb5a8c3a71c6cd1dc050e873f7e8572949208f32425c7bce2c6fa6f78a11' 
  AND token = 'BU27MTB3/4FvS8+SHMOHfW9ISEkBlGYzdBJ+yoCITXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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