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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89650fa6c6c215966d67885065e68e9617a6da33c9d6df02c5b8b9afac4cc631' 
  AND token = 'B71SzdrNZgYGTXCz3EkSM23VFFlob+lsS65cIgF2SHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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