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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068ec521c262f1946560672a19473d30deece8427330fc79eb989e66d8c6f8e4' 
  AND token = 'G3LVVMpkefWeAfd8PU/UGO/rGTc5pvetgaEjQb70WSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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