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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb7070ea5e5e7a209d05201b5a1b8dfcb9f4532cc41bb15f10e3bcd6a157a87' 
  AND token = 'VKtk40zx6EMTRXewMg3fyeCsCLDoThN6Ds85IfqpRtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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