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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9b83984a69a432249f92d87f1b9a2f2601e19a917e91d07806669b15685779' 
  AND token = 'ADFos1yVs5if5fX86OTT201g8e+cs4eZcYi+RTdgpo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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