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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc7e64eef72871060cb7216a897e46265cafbb8ec0a35f27c1a6b9665675ef8' 
  AND token = 'CKx/Wwqd/FxxDWBk0W30edHnBb+19NvHXAD3JEFoSQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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