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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6873985643641bcbbc21143982a4b01eb45f965cefa243e0436998c103354d' 
  AND token = 'z6qKNyiHyHidxxMURxHcul9k7OmtUQRenQbGt2JSeq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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