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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8da42f4be35172f39067c675c2297be5a993ad0958774ecd9122ee23e977303' 
  AND token = 'cCKWzM9eIGssDBZg4BaOzLjN1B2ji0s5brlhDZ9Dfsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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