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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0471d2f4e492ab7210d66bde3fddd1dd1a2a3c195598d3ec7859845272bd96d5' 
  AND token = '/XoDu2NE0G6xQhbLW2XR51gBQh26VFxbUoHeI5FFMNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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