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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327746cb8ca40e4c2c6e3b868b22366f59e026b1e9c744ca3bbf14b53bafcc3b' 
  AND token = 'feQ7F893Rm2skyiVxGMmMLaHPaLw/gv2qYdFhG+eBis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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