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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b0810fe8b90e603433a2acca58ad0516037b44795502a4a121bc74120fb1de' 
  AND token = '391Rw4VoP43O/w2kx2mqfinqUvhNubHNm9CaypDffXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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