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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebdd83f1b54b324979eb8b665343fa655eedc3a5fbe0d7b09eeb7085def1353' 
  AND token = '2P2YxlMS/o2drSESroYlbvdJpOZaP3Wl7K0E2/l6faU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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