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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6bdc1c6c046a904f2ced7d30fd5bc6b4ff3f803d3cbeec2d96cea48f2b9e07' 
  AND token = '1uHmHhrwLE1cu5XcIoHtrk1hHn8W1MSV6Ekga0U+PjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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