SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cdcc549e2d8d48e78acb945bff61c293e76eb3cd6baa928b9ae3331a958e9e' 
  AND token = 'NJ4GEn2bxj4+2M/g8KGZdA4LZ4qAIOfhCrVVNCqY9gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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