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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9d013472e9e784d4933bd4d4006ed1e214d8cc827a040d4b5e768ef50a38f8' 
  AND token = '2iy7bpRSM2Aq0tSoWDAQhM3+pYrl8AY6gU99I+heC1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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