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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3ec9613b3742f10f7ef083b4e8e4d9a2075b552e303ae107aa24940691014d' 
  AND token = 'OXA9YcY9/qHbenGlfQMQLMML4q4+ltXzmcK/nrx/Grw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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