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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b4902d834d1ea8b35ebf40f33f0de1dbbc8070e0c17fe89c14c28ae2f3d4de' 
  AND token = 'MhMpAgwQNwtc4JF9mbwknFGxcbG/S06CpOw5x05/8zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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