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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f66cfdcd982c8a44d6e367f3cbb6595d244be23b0d0d1322f4b502d50c7159' 
  AND token = '8xLoJEa8KAKSOV7tJJ2EIvY4wrRBYs2ddbH92qBqit8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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