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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b79a40f901b40dff9b42d1aa9ba784cd93e9ca0a408b6ec6e6b0504335c343' 
  AND token = 'LWxNWYAZSJa5duj6IM6RdQ1Lg3++R0GTDVH6CayIDK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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