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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b513e6d303cfa6f3c99ffedb5af95dc04c3029d313b4668aabe0a19be3f38bf' 
  AND token = 'nqy9EcAOO/fg+0ktoysP20PJ7gPLXxmuB8gciO5ZUh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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