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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb8a7e290453135332b1d6df04833dc05e7169b32ab3e6676ed495626b1eddd' 
  AND token = 'enBFqDcJmhKVEC9JZ4/khmQDN7P+4Qu/1XkZaA09WhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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